Air-pump



mdModei.) Y y W." STANLEY, Jr.

Patented Dec. 12, 1882;,

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UNITED STATES PATENT OFFICE.

VVIL LIAM STANLEY, JR., OF ENGLEWOOD, NEW JERSEY, ASSIGNOR TO THE SWAN INGANDESGENT ELECTRIC LIGHT COMPANY, OF BOSTON, MASS.

AIR-PUMP.

SPECIFICATION forming part of Letters Patent No.

269,133, dated December 12, 1882.

Application filed April 27, 1882. (No model) To all whom it may concern:

Beit known thatI, WILLIAM STANLEY, Jr., of E'nglewood, in the county of Bergen and State of New Jersey, have invented a new and useful Improvement in Air-Pumps, of which the following is a specification.

In an application for Letters Patent filed contemporaneously herewith I described an apparatus embracing a mercurial air-pump, in combination with a common exhaust-pump, especially designed forexhaustin g globes of electric lamps. In that apparatus no provision was made for the return of the mercury-supply to the upper reservoir other than lifting it up by hand; also, inasmuch as the exhaust is through a single tube, necessarily of small bore, the operation, when it is desired to exhaust several vessels at the same time, is considerably protracted.

It is the object of the present invention to provide means by which several lamp-globes or other vessels canbe exhausted by the application of substantially the same principle as quickly and nearly as economically as a single vessel could be by such former application.

The invention consists in the combination of several mercurial air-pumps with a single common exhaust-pump; also, in the means for establishing a constantsupply of mercury by the operation ofthe same exhaust which removes the air from the mercurial pumps, substantially as hereinafter more fully described and claimed.

The invention is illustrated in the accompanying drawing, which shows a view in perspective ot the apparatus employed, and in which-- A represents a common exhaust pump, worked by steam or other convenient power.

B, O, and D represent a series of mercuryreservoirs, arranged one above the other, and separatedt'rom each other vertically bylessthan thirtyinches. Each of these reservoirs, except the lower one, is air-tight, but is provided with a stop-cock, as p and q, orother means to admit air into its top over the mercury when required.

E is an exhaust-tube connected to the pump A, and into which lead a series of tubes, j, which are connected respectively to a series of bulbs, a, forming air-chambers in the separate mercurial pumps. These mercurial pumpsand their operati0n,when separately combined with an exhaust-pump, were fully described in the specification of the application above referred to. v

F is a tube connected on the one hand to the exhaust-pump A, and on the other hand to the upper part or air-chamber of each of the mercury-reservoirs, as G and D, except the lower one of the series, by means of the branch 6o tubes f and f, which are provided with stopcocks n and o. The lower part of each reservoir is connected to the upper part or air-chamber ofthe reservoir next above it by means of a pipe, as G or H, provided with a stop-cock, 6 as lor m.

I is a supply-tube leading from the upper reservoir, 1), and connected by tubes g to each of the series of mercurial pumps, and it is inclined downward from the reservoir sufficiently to permit the mercury to flow freely to the tubes 9. t Jis a tube leading into the upper part of the lower reservoir, 13, and with which the tubes at, leading from the airchambers c, are connected. This tube is inclined to allow the lnercury to flow into the reservoir. The ends of the tubes E, I, and J farthest from the reservoirs are sealed. A series of globes, k; or other vessels to be exhausted are attached by tubes j to the separate bulbs a, which are in turn connected by tubes bto the air-chambers c. The operation of this apparatus is as follows: By working the exhaust-pump A, a large proportion of the air in each of the vessels It is readily removed through the main exhausttube E, the mercury being forced backward from the reservoir B, through the pipe J, and up the tubes d by reason of the partial vacuum thust'ormed. The stop-cocks h are then opened 0 sufficiently to discharge the mercury in a rapid succession of drops, by which successive portions of air are removed from each of the vessels 7c, and are forced down the tubes 1) into i the air-chambers c, whence the air is exhausted 5 by the pump A thrcp gh the tubesf and E. To raise the mercury which accumulates in the lower reservoir, B, to the upper reservoir, whence it can flow to the tubes 9, and thus establish a con tiuuous supply, it is first raised into I00 an intermediate reservoir or reservoirs, as C, by exhausting the air from the upper part or air-chamber of such reservoir through the open stop-cock n, branch pipe f,and main pipe F connected to the pump A, which will cause the mercury to ascend. the tube G into the reservoir 0. By exhausting the air from the chamber of the next higher reservoir of the series,

closing the cock n, and opening the cock q in the top of the reservoir 0, the mercury will be forced up the'tubeH and into the next higher reservoir, as D.

It is observed that by increasing the number of these reservoirs and connecting them, as above described, with each other and the exhaust-pump, the supply of mercury can be raised to any desired height by exhausting the air from these reservoirs simultaneously, and by the same pump by which it is exhausted from the air-chambers of the mercurial pumps.

What is claimed as new is-- 1. The combination of a series of mercurial air-pumps with a single exhaust-pump, substantially as and for the purpose described.

2. In combination with an exhaust-pump,aseries of mercury-reservoirs, arranged one above the other and connected by means of tubes, the upper reservoirs of the series being provided with air-tight chambers, constructed to be opened and closed to the air at pleasure, substantially as and for the purpose described.

3. The combination, with a series of mercurial air-pumps and a common exhaust-pump, of a series of mercury-reservoirs, arranged one above the other and connected to each other and to the exhaust-pum p and the several mercurial pumps by means of tubes, whereby the mercury is raised in the reservoirs and the air removed from the mercurial pumpssimultaueously by the operation of the exhaust-pump, substantially as described.

WIILLIAM STANLEY, JR.

Witnesses:

JAMES S. GREvEs, R. F. GAYLORD. 

